How a Comic Book Seller Built a Multi-Platform Recommerce Business

Michelle’s latest Treecat Chat featured a conversation with Justin, founder of Investment Comic Books and a longtime seller across eBay, Mercari, Whatnot, and other marketplaces. Justin’s story is a great example of how a side hustle can grow into a focused, profitable recommerce business with the right mix of passion, branding, and operational discipline.

A Passion Project Turned Business

Justin got back into comic books in 2013 after years away from the hobby. What started as a personal interest in superhero media and vintage comics turned into a serious selling operation as he began sourcing books from flea markets, garage sales, and comic shops.

His business model is built around high average selling price and low volume, which means he focuses on valuable inventory rather than large-scale turnover. That approach has helped him keep the business manageable while still creating meaningful income.

Why Consistency Matters in E-Commerce

One of the biggest takeaways from Justin’s approach is his emphasis on customer experience. He credits much of his growth to:

• Careful packaging
• Fast shipping
• Clear communication
• Consistent listing quality

He also highlighted how strong feedback helps sellers stand out on marketplaces like eBay. In a crowded marketplace, that extra effort can make a real difference in reputation and repeat sales.

Using Technology to Save Time

Running a side business while working full-time and raising a family requires smart systems. Justin shared how he uses technology to manage crosslisting and inventory, including Treecat’s Fast Match feature to reconnect existing listings across marketplaces.

That kind of automation matters for resellers who sell on multiple platforms. It reduces duplicate work, helps maintain consistent titles and inventory, and makes it easier to update listings as marketplaces change.

He also mentioned using practical tools and cost-saving shipping strategies, including:

• Free USPS materials
• Shipping services like Pirate Ship
• Creative packaging solutions to protect comic books affordably

Lessons from Selling on eBay, Whatnot, and Beyond

Justin has been selling on eBay since 1999, but he also understands the differences between platforms. His experience with Whatnot shows how important it is to know each marketplace’s culture.

According to Justin:

• The Whatnot marketplace can work well for buy-it-now sales
• Live selling is harder to break into
• Strong communities on live platforms can be difficult for new sellers to enter
• Niche expertise helps sellers stand out

He also noted that emerging marketplaces continue to evolve, which creates opportunities for sellers who stay flexible and willing to test new channels.

Branding, Community, and Long-Term Growth

One of Justin’s biggest reflections was that he wished he had locked in his brand name and visual identity earlier. Over time, he realized how much branding matters for recognition across platforms and live selling communities.

His advice for resellers is simple but powerful:

• Choose a memorable brand name
• Keep visuals consistent
• Build trust through service
• Stay active in your niche community

For Justin, comic books are more than inventory. They’re part of a community, a hobby, and a long-term business strategy.

Final Thoughts for Resellers

Justin’s story is a reminder that there’s still plenty of room for small sellers in 2025, especially those who focus on quality, organization, and customer trust. Whether you sell collectibles, fashion, or other resellable goods, the same principles apply: start small, stay consistent, and use the right tools to scale efficiently.

Treecat users can take away a lot from this conversation—especially the value of automation, strong branding, and multi-platform selling.

Want to learn more about crosslisting and reselling tools? Treecat helps sellers streamline inventory management across marketplaces.